public class Example12_1 { 
   public  static void main(String args[]) { 
       SpeakElephant  speakElephant;
       SpeakCar  speakCar;  
       speakElephant = new SpeakElephant() ;     
       speakCar = new SpeakCar();               
       speakElephant.start();                        
       speakCar.start();                         
       for(int i=1;i<=15;i++) {
          System.out.print("主人"+i+"  ");
       }  
   }
}

